G.f. satisfies: a(n) = [x^n] ( A(x)^n + 1/A(x)^n ) for n>1, with a(0)=a(1)=1.
A237644
G.f. satisfies: a(n) = [x^n] ( A(x)^n + 1/A(x)^n ) for n>1, with a(0)=a(1)=1.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =63a(4) =2116a(5) =113550a(6) =8687239a(7) =891701755a(8) =118110608484
External references
- oeis: A237644